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प्रश्न
Classify the following as physical or chemical changes :
- Cooking of food
- Boiling of water
- Cutting of trees
- D0issolving salt in water
- Digestion of food
- Melting of ice
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उत्तर
- Cooking of food – Chemical change
- Boiling of water – Physical change
- Cutting of trees – Physical change
- Dissolving salt in water – Physical change
- Digestion of food – Chemical change
- Melting of ice- Physical change
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Dissolving common salt in water.
Ripening of fruits is a desirable change.
Write short answer.
Give an example of desirable change which can also be undesirable
Write true or false
Decomposition of leaves is a fast change.
Which of the following are physical changes ?
- melting of iron metal
- rusting of iron metal
- bending of an iron rod
- drawing a wire of iron metal
Read the paragraph and note down the various types of changes it mentions.
It was nearing six o'clock in the evening. The sun was setting. A breeze was blowing. Leaves on the tree were shaking. Sahil was sitting in the courtyard, rolling balls of wet soil, and shaping them into various toys. Then he felt hungry and went into the house. Mother made a dough from wheat flour and fried purees. While eating hot purees, his attention was drawn outside the window. It had started raining. There was lightning, too. Sahil was enjoying his dinner in the dim light.
Give reasons why – separation of mixtures e.g. iron from a mixture of iron and sulphur is a physical change, but heating a mixture of iron and sulphur is considered a chemical change.
Select the correct answer from the choice given below to complete the sentence
The matter is added or removed during a ____________ change.
Match the examples of changes in List I with the correct type of change in List II.
| List I | List II |
| 1. Burning of paper | A: Physical change |
| 2. The ringing of an electric bell | B: Chemical change |
| 3. Curdling of milk | |
| 4. Electric light is switched on | |
| 5. Melting of butter |
You are given some candle wax. Can you make a candle doll from it? What kind of change is this?
